Improvement in molding and casting pipes



UNrrn Sra'rns BENJAMIN S. BENSON, OF

l rrrnnr FFTCE.

BALTIMORE, MARYLAND.

IMPROVEMENT IN MOLDING AND CASTING PIPES.

Specification forming part of Letters Patent No. 37,674}. dated February17, 1863.

To all whom it may concern:

Be it known that I, BENJAMIN S. Bnnson, of the city and county ofBaltimore, in the State of Maryland, have invented a new and usefulImprovement in MOlding and Casting Pipes; and I do hereby declare thefollowing to be afull and exact description of the same, reference beinghad to the accompanying drawings, making part of this specification, inwhich- Figure 1 is a perspective view of a flask separated in suchmanner as to expose the core and other internal parts. Fig. 2 is avertical section at a; 00, Fig. 1, showing the flask coniplete and readyfor pouring. Fig. 3 is a perspeetive View of the base-plate orchill-ring, hereinafter described. Fig. 4is a perspective View of ametallic anchor employed to sup 1 port and brace the center part of thecore.

Similar letters of reference indicate corresponding parts in the severalviews. 1

l l I I My present improvement consists, first, in a device forsupporting the lower end of the core; second, in a device for preventingthe deflection of the central portion of small cores; third, in a devicefor preventing the entrance of sand, metallic oxide, or other foreignniat- I ters within the mold in theaet of pouring.

To enable others skilled in the art to which my invention appertains. tofully understand and use the same, I will proceed to describe I itsconstruction and operation.

The flask is made in two parts, A A, formed with vertical flanges a a,and secured together either by bolts 1) or by clamps B and wedges B. Thesaid parts are also provided at the lower end with horizontal flanges cc, resting upon an annular plate, 0, which is secured to the flange 0 bybolts 0'.

D is a base-plate or ehiltring provided at its center with an annularflange, (1, project ing upward through the central aperture of the plate0, and constitutes a seat to support the lower end of the core E andprevent its displacement. The core E is encircled by a band, F, which isprovided with studs or projeetions f f, resting against the interior ofthe mold, and constitutesan anchor to prevent the deflection of thecenter or intermediate portion of the core. This anchor is shown by aseparate view in Fig. 4. It may be formed of any suitable metal, andafter the casting is completed will readily separate from the core andremain in and form a part of the pipe without metallic oxide, sand, orother foreign matterv within the mold. The said combustible shield isheld in position by a cope-ring, H, formed with gates h 71, throughwhich the melted metal may pass.

In Fig. l a portion of the ring H. is represented as broken away toexpose the combustible shield to view.

Operation: Theflask having been locked to gether, the interior of themold is formed by introducing sand within the flask, in the mannerdescribed in my patents of July 30 and September 3,1861. The mold beingthus prepared in any desired 1nodc,the core is inserted within it, witha sufficient number of anchors F to prevent its bending or deflection.The lower end of the core is held precisely in the center, and securedagainst displacement by means of the seat d. The annular shield G andcope-ring H being then placed in position, the mold is ready forpouring. The shield G effectually prevents the entrance of loose sand ormetallic oxide; but when the molten metal passes through the gates h itinimediatelypenetrates the shield and enters and fills the mold. Thisdevice will thus be seen to eifectuallypre vent the mingling of sand oroxide with the metal, which is well known to constitute a common sourceof imperfection in the manufactured article. The seat (I being heldwithin a plate, C,-extendin g completely around it, and attachedsecurely to the part A of the flask, guides the lowerend of the coreinto an exactly central position, and so holds it without anypossibility of displacement. The said annular plate-Qbeiug bolted to onepart only of the di vided flask, allows the flask to be partially openedfor the withdrawal of the pipe, leaving the annular plate on the bottomwhole and entire, without being cut into two segments, as otherwisewould be necessary if the ring were bolted on both sides of the flask.In case of the annular plate being cut in two segments and bolted undereach section of the flask, a great difflculty occurs in closing theflask to prevent shifting, in which case the annular flange of thechill-ring will not fit, thus allowing the metal to escape in casting,and throwing the lower end of the core to one side of the mold, whichwill necessarily make the pipe thinner on one side than the other. Bymeans of this device for holding the lower end of the core, and theanchors which secure the intermediate portions against displacement, anyinequality in the thickness of different parts of the pipe iseffectually prevented.

Having thus described my invention, what I claim therein as new, anddesire to secure by Letters Patent, is

1. The annular flanged base-plate D d, em-

ployed in the described combination with the annular plate 0, andconstituting a seat to guide and hold the lower end of the core, asexplained.

2. The detachable anchor F f, constructed and applied substantially asdescribed, to prevent the deflection of the intermediate portion of thecore.

3. The shield G, employed in theinanner explained, to exclude sand,metallic oxide, or other foreign matter, and permit the entrance of themolten metal.

BENJAMIN S. BENSON. lVitnesses:

EDM. F. BROWN, CHARLES SMITH.

